Method and System for Sound Mitigation During Initiation of a Packet-Based Real-Time Media Session

1. In a mobile station having a user interface, wherein the user interface includes a microphone for receiving speech signals from a user, a speaker for playing out speech signals to the user, an output mechanism for presenting information to a user, and an input mechanism for receiving input from the user, wherein the input mechanism includes a push-to-talk (PTT) mechanism engageable by the user to invoke a PTT session as a packet based real time media session via a radio access network serving the mobile station, a method comprising: receiving, by user engaging of the PTT button, a user request to initiate a PTT session; responsive to the user request, beginning a session initiation process comprising sending a Session Initiation Protocol (SIP) INVITE message via a wireless packet data connection, seeking initiation of the PTT session, wherein a period of time from when the mobile station receives the user request until the PTT session is set up defines a setup period; and during the setup period, playing out to the user, via the user interface, a ring sound to indicate to the user that the PTT session is being set up, wherein when the mobile station is playing out the ring sound, the mobile station is not receiving the ring sound from another entity but is rather generating the ring sound itself.

2. The method of claim 1 , wherein playing out the ring sound to the user during the setup period comprises playing out the ring sound to the user for all of the setup period.

3. The method of claim 1 , wherein playing out the ring sound to the user during the setup period comprises playing out the ring sound to the user for a substantial portion of the setup period.

4. The method of claim 1 , wherein playing out the ring sound to the user during the setup period comprises: beginning to play out the ring sound to the user right after receiving the user request; and stopping playout of the ring sound upon determination that the PTT session is set up.

5. The method of claim 1 , further comprising beginning to play out the ring sound to the user upon receipt of a SIP TRYING message sent in response to the SIP INVITE message.

6. The method of claim 1 , wherein playing out the ring sound to the user during the setup period further comprises: stopping playout of the ring sound to the user upon receipt of a SIP 200 OK message indicating that the PTT session has been established.

7. The method of claim 1 , further comprising: before receiving the user request, storing a representation of the ring sound in data storage of the client station, wherein playing out the ring sound to the user comprises retrieving and playing out the stored representation.

8. The method of claim 7 , wherein the stored representation of the ring sound is a digitized version of the ring sound.

9. The method of claim 1 , wherein the mobile station is a cellular mobile station.

10. A mobile station comprising: a wireless communication interface for engaging in wireless communication with a radio access network; a processor; data storage; ring sound data representing a ring sound, stored in the data storage; a user interface includes a microphone for receiving speech signals from a user, a speaker for playing out speech signals to the user, an output mechanism for presenting information to a user, and an input mechanism for receiving input from the user, wherein the input mechanism includes a push-to-talk (PTT) mechanism engageable by the user to invoke a PTT session as a packet based real time media session via the radio access network; and program instructions stored in the data storage and executable by the processor to carry out functions comprising: (a) receiving, by user engaging of the PTT button, a user request to initiate a PTT session, (b) responsive to the user request, beginning a session initiation process comprising sending a Session Initiation Protocol (SIP) INVITE message via a wireless packet data connection, seeking initiation of the PTT session, wherein a period of time from when the mobile station receives the user request until the PTT session is set up defines a setup period, and (c) during the setup period, playing out to the user, via the user interface, a ring sound to indicate to the user that the PTT session is being set up, wherein during playout of the ring sound to the user, the mobile station is not receiving the ring sound from another entity but rather generates the ring sound itself.

11. The mobile station of claim 10 , wherein the program instructions are executable to play out the ring sound to the user for all of the setup period.

12. The mobile station of claim 10 , wherein the program instructions are executable to play out the ring sound to the user for a substantial portion of the setup period.

13. The mobile station of claim 10 , wherein the program instructions are executable to begin playing out the ring sound to the user right after receiving the user request and to stop playing out the ring sound to the user upon determination that the PTT session is set up.

14. The mobile station of claim 10 , wherein the program instructions are executable to begin playing out the ring sound to the user upon receipt of a SIP TRYING message sent in response to the SIP INVITE message.

15. The mobile station of claim 10 , wherein the program instructions are executable to stop playing out the ring sound to the user upon receipt of a SIP 200 OK message indicating that the PTT session has been established.

16. The mobile station of claim 10 , wherein the data storage contains a representation of the ring sound before the cellular mobile station receives the user request, wherein the program instructions are executable to play out the ring sound to the user by retrieving and playing out the stored representation.

17. The mobile station of claim 16 , wherein the stored representation of the ring sound is a digitized version of the ring sound.

18. The mobile station of claim 10 , wherein the mobile station comprises a cellular mobile station.